Digestive system-
Paired appendages around the mouth are used for collecting and handling food and are usually specialized in accordance with the particular diet of the animal. Nervous system-
Their nervous system is "ladder like," with two ventral nerve crods running through all segments and forming two ganglia in each segment. Body plan-
exoskeleton (a skeleton on the outside of the body)
body divided into distinct parts
jointed legs and appendages
bilateral symmetry (both sides of the body are the same)
Positive impact on humans -link in food chain -pollination, most seed plants would not exist, ~65% insect pol. -human food, specifically crustaceans, several million pounds annually from Gulf of Mexico alone (primarily shrimp) -silk -spider silk can be stronger than steel of the same gauge. -insectivorous arthropods help control insect pests Ex. lady bug -soil dwelling arthropods scavengers and decomposers -Esthetic and psychological Negative impact on humans -Ticks -Mites -Mosquitoes -Fleas -Lice; look upon people, their pets and livestock as just another meal (parasitic larva can also be involved) -Painful bites of stings in self-defense, more people die of bee and scorpion stings than by snakebite (or shark attacks!) 1 interesting fact
They first evolved about 445 million years ago during the Late Ordovician Period.
Digestive system-
Paired appendages around the mouth are used for collecting and handling food and are usually specialized in accordance with the particular diet of the animal.
Nervous system-
Their nervous system is "ladder like," with two ventral nerve crods running through all segments and forming two ganglia in each segment.
Body plan-
Picture-
http://www.biologycorner.com/bio1/notes-arthropods.html
Positive impact on humans
-link in food chain
-pollination, most seed plants would not exist, ~65% insect pol.
-human food, specifically crustaceans, several million pounds annually
from Gulf of Mexico alone (primarily shrimp)
-silk
-spider silk can be stronger than steel of the same gauge.
-insectivorous arthropods help control insect pests Ex. lady bug
-soil dwelling arthropods scavengers and decomposers
-Esthetic and psychological
Negative impact on humans
-Ticks
-Mites
-Mosquitoes
-Fleas
-Lice; look upon people, their pets and livestock as just another meal (parasitic larva can also be involved)
-Painful bites of stings in self-defense, more people die of bee and scorpion stings than by snakebite (or shark attacks!)
1 interesting fact
They first evolved about 445 million years ago during the Late Ordovician Period.